Self-acting telephonic line-connecting system.



r B KUGELMANN I SELF ACTING TELEPHONE LINE CONNECTING SYSTEM: AYPLIOATION PILiiD JUNE 12- 1907.

Patented Oct. 18, 1910.

2 8EBBT8-8EEET 1.

B. KUGELMANN.

SELF ACTING TELEPHONE LINE GONNEGTHIG SYSTEM.

APPLICATION FILED JUNE 12, 1907. Y

Patented 00$; 18, 1910.

690600 0000 000000 00000 00000 00050 008000 OOOOOU 060 00G v Bavaria, part of the German Empire, have i mg to experience.

. in the well known manner.

. cordingly provided for a group of 100 submg contacts and line contacts, with which .the-eifect is produced, that of all the pre )UNiTED STA ing Telephon'ic Line-Connecting System, of

100 subscribers, say 10 to 15 lineselecting 7 devices or for a group of 200 subscribers there are provided about 20 line selecting sides in the fact, that it is distinguished subscriber, aside from the ordinary line se- TES PATENT OFFICE BERNHARD KUGELMANN, 0F BAD KISSENGEN, GERMANY.

SELF-ACTING TELEPHDNIC LINE-CONNECTING SYSTEM.

Specification of Letters Patent. Application filed June 12, 1907. Serial No. 878,672.

Patented Oct. 18, 1910.

To all whom it may concern:

Be it known that I, BERNIIARD kUcnL- King of Bavaria, a resident of 3 Theresienstrassc, in Bad Kissmgen, Kingdom of invented a'certain new and useful Self-Actwhich the following a specification.

This invention refers to an arrangement in connection with .tclephonic connecting or transmitting systems of that kind, in which in the central station for a particular group of subscribers only so many line selector devices are to be used, as are required for the largest number of simultaneous connections for conversation occurring accord- In the system about to be described, there are for'instance provided for a group of devices. To each of these line selecting devices belongs a corresponding pre-selector There are acscribeis with ten line selecting devices, 10

re-selectors. Every subscriber of the group is furnished in each pre-selector with a contact arrangement, which consists of blockcontact arms ofv one of the pre-selectors are made to register automatically, as soon as the subscriber calls up. On the other hand the contact arms are connected to the line selecting apparatus, corresponding or belonging to this pro-selector, so that the calling-up" subscriber is connected to this line selecting device, thereby being enabled to efiect the desired connection.

The essential feature of this invention rcfrom the well known systems of this kind by the absence of any rotatable or stepwise actuated devices which are provided for the purpose of placing one of the pre-selectcrs 1n contactwith the line-of the calling-up looting devices and pro-selectors. In this invention however, every pro-selector is protied w th some contacts 22, 23, 25, whereby is shown the wiring selectors, it is only the next unoccupied prel selector, which can be moved by the callingup flxbscriber within actuating distance of an interrupter, provided in the central sta tion, so as to be operated by this means. On the other'hand every subscriber is provided with special relay-contacts (ll, 12). By the influence of the interrupter, the preselector, which happens to be in operating position, several pre'selectors, as will be set forth hereinafter, being operated, even, when the subscriber calls up, moves over the line contacts and the blocking contacts,

which latter are connected to the relay contacts (11, 12) of the subscribers. The calling-up subscriber will then have influenced 1115 relay contacts insuch a manner,-thus for instance by closing the contacts,-that the pre-selector, or, in case several re-selectors are moving, one of them with its contact arms is arrested upon the system of contacts (blockin contacts and line contacts) corresponding to this subscriber in the preselector, and to which the lines of the subscriber are connected. Inasmuch as on the other hand the contact arms of the pie-selector are connected to a'liue selecting apparatus, the calling-up subscriber is now in position, to eflect the desired. connectionby means of the line selecting ap aratus.

In the drawings is illustrator diagrummatically a telephone system constructed in accordance with the present invention, two subscribers stations, having the calling numbers 38 and 20, and the corresponding pro-selectors and selecting apparatus, being shown. I

Figure 1 represents a portion of such system; and Fig. 2 the remaining parts thereof.

In the interest of clearness of illustration and with a view of a better comprehension of the various (parts, the one pre-selector with correspon ing line selecting apparatus is only represented by its sets of contacts (blocking contacts and line contacts). In all line selectors W the usual form with rotatable-and displaceable shaft is shown, while of course the invention is also applicable to any other form or type of selectors In the upper left-hand corner of Fig. 1

of a subscribers apparatus which issiinilar to that of the Strowgeisvstem.

In Fig. 1, being the left hand part of the 7 m: c are mounted.

-all-in al drawing, three relays are shown for each subscriber, that is to say a calling-up relay 13 with the above mentioned relay contacts 11 and 12, a relay 14, the purpose of which will appear from the following description,

and a separating relay 15. Besides, a call-- ing-up relay 16, which is common to the entire group (Fig. 1 of the drawing, lower portion) is' provided.

Every pro-selector V consists of a rotatable and displacea'ble shaft on which a double contact arm Ir la and a double locking arm The arms le la k control the contact arrangements of the subscribers in the pie-selecting device, le li controlling a field containing double contact ins (hereinbefore called line contacts), and i controls a field of contact blocking pins ,(hereinbefore called blocking contacts). To each double contact pin corresponds a contact blockingpin. Hence, when k in, are placed on a double contact pin, k will be placed upon the corresponding blocking pin.

- mg device is shown, which comprises a relay The blocking pins are permanently and securely connected to the lines sp and 81),, of the subscribers. In the drawing three series of double contact pins and of contact blocking ins are represented, that is to say the contacts. for 30 subscribers. There is the peculiarity however, that to each row of blockin pins a separate double blocking pin is furnished. To each of these double blocking pins 2. doubleline sp, 0, 8p,

0,, 8p, 0,, is securely connected. In the inoperative' position of the pie-selector, the arms k Ic h k do not make connection with any contact. As soon as the shaft has been raised one step, k is placed upon 83),, is, on 0 on the second ste ic is placed on 0 k on SP2 and so on; la, an la do not make connection with contacts while the shaft is raised; only during the rotating movement 1:, and are moved over the double pins of the subscribers. The relay contact 12 of every subscriber makes contact with one of the lines 8p, sp 8f2 and the relay 14 of this subscriber is in contact with the corresponding line 0, 0 a, in such a manner, that a subscriber, whose calling number is for instants 38, is connected to the line sp by his relay contact 12, while'by his relay lat he is connectedto 0 that is to say, in the representaionof the invention, shown, the switching parts. (12,14) of a group of ten subscribers are included in each double line (8 c 87), 0 thus for instance sp, 0 includes the switching parts of the subscribers with the calling numbers 10 to 19. The i'eflay contact 11 of each subscriber is included his blocking line sp $39 which, as

already mentioned, is connected to the blocking pins of this subscriber in the preselectors. In the form of carrying the invention into effect, here shown by way of exam le, the relay contacts 11 of the subscriber 20 are therefore connected to 82. and those of the subscriber 38 to sp The other parts of the pro-selector V are well known as they are those of the well known "Strowger system described, for example, at pages 724 to 734 of-the Electrozcclmz'scfw Zcz't-s'c/l-rift, Berlin, 1903; they consist of the raising and rotating magnets Ina, (im, an interrupteru, which is operated by means of the blocking magnet cm and wl'ich is turned one step toward the right ever\' time, the blocking magnet is operated; and it further consists of a releasing magnet rm,

the armature of which is formed, so as to constitute a checking pawl and which rctains the shaft in its operative position, until rm is excited.

A peculiar feature of the invention resides in the blocking pins M, the function of which is explained in the arrangement given as an instance of the application of the invention.

Below each of the pro-selectors, the switch- 17 and the contacts 22, 23, 25 and which produces the effect, that when a subscriber is calling, only the next unoccupied pre-selece tors can be operated every time. The selecting apparatus IV; which corresponds to each of the pre-selectors V, differs but slightly from the latter one. The separate double blocking pins are not a part of the selecting apparatus. The double contact pins are connected to the a, b-lines while the contact blocking pins are connected to the blocking lines Sp of the subscriber. Hence, every subscriber is provided with two blocking lines 8 and Sp.

Supposing, subscriber 38 desires connection with subscriber 20. Then, subscriber 38 will ground his a-linc temporarily-preterably by taking off his receiver and thereby causes arm g to actuate the contact F and connect the same with the ground E-and he thereby produces a current impulse from the station battery S, the positive pole of which is grounded, the current passing as followsz negativt pole, universal callingup relay 16, line 21, upper contact of the sep-.

arating relay 15, upper winding of the calling-up relay 13, a, earth at the calling-up subscriber station. The relay 16 closes its contact and prcduces,-supposing that the first preselcctor is unoccupied,a local current by way of the raising magnet km of this pre-selector, which passes as follows negative pole of S, contact 22 on relay l7, lam, contact 23 on relay 17, contact on relay 16, positive pole. In consequence thereof hm raises the shaft '10 one step, so that the head contacts above the shaft are closed.

The closing of the head or top contacts produces in its turn a local current, which flows during the operative position of the shaft as follows :-negative pole, relay 17,

- and 22 are opened and the contact top contact, ea'.th, so that the contacts 23 is closed by the responding of the relay 17. \Yhen the contact 25 is closed, a local cin'rent flows by way of the blocking magnet am as follow ':negative pole, contact 25, resistance 26, so), fourth arm of the switch u hea l contact, earth. This results in the closing of the contacts 27 and 28.

remains closed only in the extreme operative position and during the return movement of the magnet am.

tact 27, second arm of the switch u, resist ance Z, (left hand part or Pig. 1 of the drawing), lzm lmul-contact, earth.. This results in the raising of the shaft on each inn pulse by means of Am.

prevents unintentional branching off of the current from the ncgativepole by way of '25, 26, 2S, p, [on or by way of (ll/2t, head contact and; earth. After each operation of km the closed circuit contact is opened.

The above mentioned contact 28 on the blocking magnet 8m, produces the effect, that one end of the winding: of the blocking magnet-smis in connection with the contact arm fla during the extreme operating position of its armature and during the return movement of the same. New, in case the shaft 21. in the example herein described, is raised three steps, because a subscriber in the third group of tens has called up, 7a,, is in'engagement with Now inasmuch,

as s has been directly grounded by the calling-up subscriber number 38 by way of the contact 12 of this subscriber (as above described), both the ralslng magnet lnnas well as the blocking magnet- .sm, are

short circuitcd by means of 7: s7)". earth and the head switch or by way of 28, li 8 earth, head switch and u, inasmuch as t the current will now pass'by way of negative pole S, UM, 27, -u'-'. lg. e f". earth, positive S or by way of negative S, 25, :26, 28,

. second field of contacts.

7.1., $1), earth, positive S, so that no further interrupter current flows by way ot hm,-

while on theother hand am will not afford passage to the current and releases its armature. The return movement of this armature produces the well known effect, that the switch a is able to turn around to the As soon as this is done, a current impulse takes place by way The contact 98, is arranged in such a. mannor, as indicated by the dart lzne,-t.hat it Q The closing of the contact 27 produces interrupting currents by way of .the raising magnet 11112, W rich pass as fol lows :negative pole. interrupter, Ubr,con-

This current impulseexcites the relay 14 and interrupts by this means the circuit s1), earth, so that other moving pro-selectors are notarres'- "t after the third step, unless sp grounded by the medium ofanother i calling-up subscriber (with a calling number between 30 and 39). The relay ll will then remain excited for some time by the arresting current. passing by way of its contact 12 of relay 1'3, earth. When the switch is on the second field of contacts, the rotating movement of the shafttakes place under nearly the same conditions as during the raising movement. First of all smwill again oller a path for the current (the current passing by way of n gative pole, conswitch 21, head contact, earth). Besides, interrupter currents will pass into the rotating magnet (1/11, as soon as the blocking :nag-. nct am has attracted its armature completely and has closed the contact 27. These interrupter currents pass as follows, from the negative pole, to contact of the interrupter Ubr, contact 27, second arm of the switch a, resistance Z, (right hand or Fig. 3 of the drawing) (Z'm, head contact, earth.

After eight such interrupter 'currents have subscriber. Inasmuch however, 8 has been grounded by the calling-up subscriber directly by way of' the contact 11, both Jm as well as cm, are short circuited'in the same manner as above explained with reference to 11m and emf No further interrupter currents can therefore pass by way of (lm; and on the other hand no current will pass that the switch 1! can move upon the third field of contacts. No current or at least no current of any noticeable force will pass through the winding 1 of the relay 1?), upper contact of ll, earth. he winding 1 of relay 15 has a resistance of nearly 750 ohms). \Vben however the switch 1/ is upon the third field of contacts, 7.1,, and sp in consequence are placed directly on the negative pole, which is done by way of the third arm of :1, see dotted line, so that now, especially when the contact 11 is grounded by way of a resistance, not shown in the drawing, a' considerably stronger current will also flow through the winding 1 of the relay 15 (negative pole, third arm of the switch 1:, li s winding 1 of 15, upper contact contacts, whereby the current is prevented from passing through the relay 13, whereby on the other hand the current is also cutoff from the relay 14. As long as the preselector is placed on the lines of the callingup subscriber 38, the current passes as folniiddle contact, which connected to the, negative pole, by way of relay 14, middle tactresistance 26. fourth arm of the taken place, 7.1. has been placed in contactwith the blocking line 81),, of the calling-upof 14, earth). Relay 15 opens and closes its through cm, which releases its armature, so

lows nc auve ole. third arm of the D I l w l I switch .u, 75 sp lower contact of 1a, winding 2,-earth, so that remainscxcitedand the relays 13 and 14 are se iaratcd of? from the station battery. The pro-selector ISDGW in engagement by means of its contact- 21 ms c k with the lines and b of the callingup subscriber,- whois nowenabled to operate the corresponding selecting" apparatus by" way of k k 1 i As already mentioned, more than one preselector is moved by one subscriber, be-

.causr the current impulse, negative pole, 16, :uppi-r contact of 15, I: per winding of 13,45,

earth, may lastany 1 cngth of time at the calling-up subscriber station, so that the relayltiis'still excited, while the relay lilies already causec its armature to be turned.

.This results in causing the current to pass through contact 25, contact 2:2 (1' 1g. 2)

lifting magnet lam, contact 23' and the contact of the relay 16 to the earth and in consequence the movement of the'prc-sclector V.' Suppose the case, that two subscribers (for instance 29 and 38) are calling-up simultaneously, several pro-selectors are operated which is done with a slightinterval of time,-inasmiich as the first local current by way of the raising magnet km of a preselector. can only take place anyhow, after the preceding ore-selector has been raised one step and alter the relay 17, belonging ,to the latter pro-selector has caused the al terati n of its field of contacts. This small interval of time produces the etlect, that every subscriber is provided with a preselcctor V and consequently with a selector arm Z, inasmuch as the lust operated preselector is arrested by the grounding of the conductor 82, and is caused to rotate, whereupon 5 is immediately cutout from earth again .(in the lower contact of 1-1), so that the next pro-selector may move uniinpedcdiy as far as sp Since more pro-selectors can be operated, than it is possible to call up subscribers, the arrangement is such, that a preselector, which has been raised through eleven steps, is returned to its inoperative 'posnion automatically, because in. this case,

11,, k wi-ll' engage two contacts w, which are legged to earth, so that the relaysRa, Rb of the corresponding selecting apparatus, which are connected to Is 10,, are excited,

the circuit being from the negative pole of by way of the b-line conductor,

duces a number of impulses which corre-- spond to the desired call number, in the selecting apparatus. The short interval of time from the moment of the first grounding, (on the taking off of the telephone by the calling up subscriber) to the commence- .ment of the series of current imulses, is suiiicient for the above describe :switching operation, the interrupter currcnts following each other very quickly. The, subsequent switching operation' is well known. Every impulse produced by the numbering switch by waycf the a'lirie'conductor, ex-

cites the relay Ra. of thehselecting apparatus by way of a, A, Ra;-U 14 S, earth, thereby producing local currents, as follows :-negative pole of the central battery S 6 rating 'conta'ctat ,Ra, raising magnet fourth arm of the' switch U osit ve pole. In consequence thereof raises the shaft two, steps in the present instance. The current; impulse pro iuccdby the numberingswitch calling up subscriber station, I), la R71, :second arm of U, fifth arm of u, ne ativc pole, produces by the responding of lowing local current: positive ole, SM, contact at Rb, negative pole. Mis excited and when it is cutout of circuit, it moves the switch U upon the second held of con tacts. in consequence thereof the next series I) the fol 4 earth in the of current impulses produces local currents by way of Re and by .way of the rot-atin ma -net DM, the current ,passing as f0 lows :--=negative pole, contact at Ra, rotating magnet DM, fourth arm of the switch U, positive pole. The shaft is rotated, which in the present instance takes place throu h' ten steps, so that the arms Ka, Kb are p aced on the line ab of the desired subscriber 20. The 6 cur-,

rent impulse causes, as above referred to, the turning around of the switch U onto the third field of contacts, so that the'desiredconnection is now obtained scribe!- 38), Ka, Ra, first arm of U (third field), Kc, [a (of the subscriber 20),by way of his station, 1), Kb, second arm of U field) Rb, Kb,-b (of the subscriber38) It is well known, that the blocking line of a busy subscriber must be connected to one (a of the sub- (thirds pole of the battery, in order that the conscribers.

In the presentcase, given by way of example, everv subscriber isprovided with two blocking ines S and s7). Ifa subscribers station with the battery and prevent, as will be seen,- any disturbanceflVhen a subscriber has called, Sp is connected to the negative pole, thus for instance in the above instance,-

nection may not be disturbed'by third subin'use these blocking lines connect 83),, of the subscriber 38 is connected b 'the lower contact of 15,th e said contact ein closed in consequence of the excitement o I the winding 2, as has-been shown above,-- and by wayv of 81),, k third arm or the switch u, to the negative pole. If a subscriber is called. his line S will also be in contact with the negative pole, for example, the line S12 in the illustration is over K. and the third arm of the switch U is in contact with the negative pole (in the selecting apparatus, occupied by the calling up subscriber 38). Inasmuch as on the other hand SP of the called subscriber is connected tothe winding 2 .of relay l5 and to the positive pole, the relay of the calledup subscriber is also excited.

For the sake of a better comprehension of the blocking; operation, 1tmay be supposed in the above mentioned instance, in which the snbsuiber 38 calls up vhe subscriber 20,- that thesubscriber has already been engaged by a third party by means of any nd of selector, thus for instance by the selector which is shown in the annexed drawing by its sets of contacts only. In this i I case, the blocking line S12 is connected to the negative pole, as has just been explained, by way of Keg), and by way of the third arm of U of this selecting apparatus. Inasmuch as on the other hand however, the subscriber '38 excites'Rb and consequently SM by the last current impulse and by way of his b 'line conductor (see above), a connection will be established between Sp and the positive pole in the moment, in which SM has attained its extreme working position (U being still maintained upon the second field of contacts), this connection being by way of K8 third arm of the switch U, contact at n Slh, releasing magnet RM, positive pole and also by way of releasing magnet rm, positive pole, so that the selecting apparatus with its pre-selecto'rs, which are occupled by the callup subscriber 38, are restored into inop- .erative position. It yet remains to point out, that by the simultaneous excitement of citi tacts 22,23, 25 are returned into inoperative position.

r the constructionaldetails' of the system described variations may occur.

'for each pre-selector, arrange What I claim and desire to secure by Letters Patent of the United. States is 1. In a tele hone system, the combination, with the subscribers? lines divided into groups, of common lines and a'number of pre-selectors for each group, each pro-selector comprising a traveling contact device, adapted to be moved successively in two directlons, and to make contact by the movement in the first direction with said common lines, and each pre-selector arranged to engage with a subscribers line.

2. In a telephone system, the combination with the subscribers" lines divided into groups, of common lines and a number of pre-selectors for each group, each pre-selec tor comprisinga traveling contact device, adapted to make contact with each of the said common lines and each pro-selector arranged to engage with a subscribers line, a switching ap aratus for each pre-selector, the said swit iing ap aratus arranged to set in action the next id e pro-selector, when a snbscribc'r is calling up.

3'. In a telephone system, the combination with the subscribers lines divided into groups, or common lines and a number ofpre-selectors for each group, each pre-seleetor. comprising a traveling contact device, adapted to make contact with each of the said common lines and each pro-selector arranged to engage with a snbscribers line, a calling relay device for each subscriber, a common relay device, a switchin apparatus for each pre-selector, arranged to set in action the next idle pro-selector.

4. In a telephone system, the combination with the subscribers lines, divided into groups, of common lines and a number of pre-selectors for each group, each pro-sew 'lector comprisinga traveling contact device, adapted to make contactwith each of the said common lines, and each pre-selector arranged to engage with a. subscribers line, a calling relay device for each subscriber, a common relay device, a switchin apparatus to set in action the next idle presclector, a line selecting apparatus connected with each preselector, and'means arranged to make the final connection. with a desired subscribers line.

In witness whereof,I have hereunto si ed 'my name in the presence of two s'ubscri ing witnesses,

BER-NHARD KUGELIQIANN.

Witnesses:

E. Banner,

I-I. Banana. 

